Hm, for me, I easily beat CPUs all the time, and I usually beat other people IRL.
But, I've always had a rivalry with my online friend named Ice; he was the first person I ever brawled who was better than me. I only win like 40% of the time against him, and we brawl a LOT. XD
(Though lag can get annoying at times; my lag is moody with him...)
When I go to actual IRL tourneys hosted by Smashboards, I tend to do bad in the actual tourney, yet I can do great in friendlies. .__.
So basically, against casual brawlers and CPUs, I easily win. Against hardcore brawlers I tend to lose.